SQL:2014 removed: DAYS, FOREVER, HOURS, KEEP, MAX_CARDINALITY, MINUTES, SECONDS. None of these were reserved in Calcite, and that remains the case.

The following became reserved in SQL:2011, and are now reserved in Calcite: LAG, LEAG, LIKE_REGEX, NTH_VALUE, NTILE, OCCURRENCES_REGEX, POSITION_REGEX, SUBSTRING_REGEX, TRANSLATE_REGEX, TRIM_ARRAY, TRUNCATE, VERSIONING.